Merge branch 'fix-repository-has-ambiguous-refs' into 'master'

Fix Repository#has_ambiguous_refs? regex

See merge request gitlab-org/gitlab!39861

app/models/repository.rb

@@ -214,7 +214,7 @@ class Repository
     return false if with_slash.empty?
 
     prefixes = no_slash.map { |ref| Regexp.escape(ref) }.join('|')
-    prefix_regex = %r{^#{prefixes}/}
+    prefix_regex = %r{^(#{prefixes})/}
 
     with_slash.any? do |ref|
       prefix_regex.match?(ref)

spec/models/repository_spec.rb

@@ -1263,6 +1263,7 @@ RSpec.describe Repository do
       %w(a b c/z) | %w(c d) | true
       %w(a/b/z) | %w(a/b) | false # we only consider refs ambiguous before the first slash
       %w(a/b/z) | %w(a/b a) | true
+      %w(ab) | %w(abc/d a b) | false
     end
 
     with_them do